获长期邀请以观察员身份参加大会届会和工作并在总部设有常驻观察员代表团的政府间组织
An intergovernmental organization that has been invited on a long-term basis to attend the sessions and work of the General Assembly as an observer and has a permanent observer mission at its headquarters
以上为机器翻译结果，长、整句建议使用 人工翻译 。